CHEM 202 Fall 2010 Practice Exams

CHEM 202 Fall 2010 Practice Exams - CHEM202 Practice Exam 1...

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----- CHEM202 Practice Exam 1 Fall 2010 NAME: Dr. Thomas Berg Total Points == 125 Questionsl-25 : 5 points each USEFUL INFORMATION: NA = 6.022 X 10 23 mort t c = 2.998 X 10 8 m·s- h = 6.626 X 10- 34 J·s
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1. The energy difference between the allowed spin states for an lH nucleus is the strength ofthe external magnetic field in which it is placed. a) independent b) directly proportional to c) inversely proportional to d) exponentially related to e) logarithmically related to 2. A compoillld shows a molecular ion peak at m / z 167. The relative inte:nsit1eifbfthe M and M + 1 peaks are 50.0 and 4.4 %, respectively. How many carbons are in each molecule ofthe compound? a) 5 b) 6 c) 7 d) 8 e) 9 3. How many of the following compounds has a vibration that is infrared inactive? CH3C=CH H 2 O CH3C(O)CH3 CO 2 CO a) 0 b) 1 c) 2 d) ,) " e) 4
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4. Which of the following compound has the lowest carbonyl stretching frequency? o o o o L II. m. IV. a) I b) II c) III d) IV e) All would have the same stretching frequency. 5. Absorption of what type of electromagnetic radiation results in ionization? a) X-rays b) radio rays c) mIcrowaves d) UV e) IR 6. The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large __peaks. a) M + 1 b) M+2 c) M - 16 d) M -17 e) M -18
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7. How many carbons would not produce a signal in the DEPT l3 C NMR spectrum of the compound below? a) 0 a b) 1 c) 2 d) 3 e) 4 8. Which of the following are considered to be (out-of-plane) bending vibrations? a) scissoring and wagging b) scissoring and twisting c) rocking and wagging d) twisting and wagging e) scissoring and rocking 9. ofthe following protons gives an NMR signal with the highest chemical shift value? F -CH2CH2CH2CH2CH2-Br 2 3 4 5 a) 1 2 ,., c) .) d) 4 e) 5
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10. How might the two trimethylcyclohexane isomers shown below be most readily distinguished using NMR?
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CHEM 202 Fall 2010 Practice Exams - CHEM202 Practice Exam 1...

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